No spark after timing belt tensioning and clutch slave cylinder bleeding
 

The last time I had my car running was 3 or 4 days ago, before I bled the clutch slave cylinder and re-tensioned my timing belt. The first thing I checked was spark, and found that I have none. Both procedures were pretty basic, so I'm not sure what I did.

What are the most common, or even not so common causes of no spark?

I noticed that when I'm trying to start the car, my oil pressure sensor stays on 0 and turns red. I don't remember if this is normal. Does a failing oil pressure sensor stop the car from getting spark? It seems unlikely that some component has died over the last few days, without running the car, so maybe I accidentally disconnected something?

When you did this, did you disconnect anything? Or just bleed the slave?

Did you have your distributor cap off? ifso did you break your rotor by accident putting things together? I did that once. ALso check your plug and coil wires all really well then i'd check your relay and fueses.

You beat me to it. Any time I have a no start or problem I always work backwards from what I 'repaired'. If the car ran fine before it has nothing to do with the clutch bleeding unless you bumped a sensor connection or something. Something got disconnected somewhere along the line during the last repair, you can bank on it.

I did not disconnect anything to bleed the slave (I left the starter attached), which is why this is so weird.

I did remove the distributor cap/cam sprocket housing during the timing belt tensioning procedure, but double-checked everything and it seems good. I put a spark tester between the coil and the cap, and got nothing, so it seems that nothing is coming from the coil

does your tach bounce? I had a no-spark problem another time and it turned out my speed and ref sensor connector had rotted and wasn't doin it's thing. I taped em together and it was like magic. I'd check those connections (should be along the back of the engine around the firewall) and then I'd also test your relay, I think it's the DME relay.

I finally got a chance to check this out again. The first thing I did was jiggle and tap what I believe to be the speed and reference sensor connectors (attached to a metal frame that bolts to the intake manifold). When I tried to start the car, it took one turn of the key, but it hesitated to start at first, then ran badly for 3 or 4 seconds once it did. After that, it ran great. I'm not sure what to make of the hesitation to start and the poor running initially, but I assume those connectors were the issue.